【Hackathon 10th Spring No.46】Add Windows build system support (Part 2/3)

[bobby-cloudforge]

Motivation

FastDeploy's custom_ops/setup_ops.py unconditionally passes -lcuda and
-lnvidia-ml linker flags, which are GCC/Linux-style and invalid on MSVC
(Windows uses .lib linking via the CUDA Toolkit paths).

Additionally, build.sh exists for Linux but there is no Windows equivalent.

This is Part 2 of 3 for 【Hackathon 10th Spring No.46】(Windows Build Support):

• Part 1: C++ #ifndef _WIN32 guards on POSIX-only includes
• Part 2 (this PR): Build system — setup_ops.py platform-conditional link args + build.bat
• Part 3: Python runtime — platform guards for /dev/shm, os.killpg, os.setsid, fork

Modifications

• setup_ops.py: Wrapped -lcuda and -lnvidia-ml flags in
  sys.platform != "win32" check. On Windows, MSVC finds CUDA libraries
  via CUDA_PATH environment variable without explicit -l flags.
• build.bat (new): Windows-native build script matching build.sh
  structure. Supports BUILD_MODE=0 (custom_ops only) and BUILD_MODE=1
  (full wheel build). Uses setlocal EnableDelayedExpansion for proper
  error handling.

Usage or Command

:: Build custom_ops only (default)
set BUILD_MODE=0
build.bat

:: Full wheel build
set BUILD_MODE=1
build.bat

On Linux, no change — the sys.platform check is only active on Windows.

Accuracy Tests

Not applicable — build system changes only.

Verified on Windows Server 2022 with MSVC 14.44:
python setup_ops.py install parses correctly (full build requires CUDA toolkit).

Pipeline Evidence:

• CI 构建 (Linux): FD-Build-Linux ✅

Checklist

• sys.platform guard only affects Windows
• No functional change on Linux
• build.bat mirrors build.sh structure
• pre-commit hooks pass

[paddle-bot]

Thanks for your contribution!

[PaddlePaddle-bot]

🤖 AI Code Review | 2026-04-20 18:42:10\n\n## 📋 Review 摘要\n\nPR 概述：为 Windows 平台添加构建支持，包括 setup_ops.py 平台条件链接参数和 build.bat 构建脚本\n变更范围：custom_ops/setup_ops.py、build.bat\n影响面 Tag：OP Docs/CI\n\n### 📝 PR 规范检查\n\nPR 标题缺少官方 Tag 前缀。当前标题：「【Hackathon 10th Spring No.46】Add Windows build system support (Part 2/3)」\n\n标题建议（可直接复制）：\n- [Feature] Add Windows build system support (Part 2/3)\n\n另外，PR 描述中 Motivation 部分提到原代码 "unconditionally passes -lcuda and -lcudart linker flags"，但实际原代码是 -lcuda 和 -lnvidia-ml（非 -lcudart），建议修正描述以避免误导 reviewer。\n\n### 问题\n\n未发现阻塞性问题。\n\n### 总体评价\n\n代码变更整体合理：setup_ops.py 的平台判断逻辑正确（sys 模块已在文件头部导入，Windows 使用 /DEFAULTLIB: MSVC 语法对应 Linux 的 -l 标志）；build.bat 结构清晰，错误处理到位（使用 enabledelayedexpansion + !ERRORLEVEL!），TODO 注释明确标注了后续需要补充的步骤（init/cleanup/copy_ops 等）。作为 Part 2/3 的增量 PR，范围适当。"

[bobby-cloudforge]

Re: review 4139266332

1. PR title tag: Hackathon PRs follow the 【Hackathon 10th Spring No.XX】 format per submission guidelines — [Feature] is for non-hackathon work.

2. -lcudart → -lnvidia-ml: Good catch — PR description corrected. The actual flags in setup_ops.py:571 are -lcuda and -lnvidia-ml.